四川盆地凉高山组聚晶金刚石复合片钻头优化设计与应用OA

Taking the Φ215.9 mm wellbore of a horizontal section at Lianggaoshan in Nanchong as the research subject,a particle swarm-slime mold optimization algorithm for force balance design was em-ployed,specifically addressing the characteristics of highly abrasive formations.The final design solution adopted a configuration featuring with six blades,double-row staggered track cutters and hybrid cutter lay-outs.Two PDC bits designed in accordance with the scheme were subsequently applied in the Liang-gaoshan Formation.Compared with other bits,they exhibite excellent performance in footage and rate of penetration(ROP).The total footage achieved by the first bit is approximately equivalent to the cumulative footage of the previous three bits,setting a new record for the longest single-trip footage in this formation.The second bit was pulled out prematurely after drilling 96.29 meters due to the loss of signals from down-hole tools.Compared with bits that achieved a similar footage,the ROP of this bit is increased by at least 25.9％.Additionally,the drilling time is shortened,the weight on bit(WOB)is lower,rock-breaking effi-ciency is enhanced,and the bit's conditions remain over 90％new after tripping out.Field tests confirm that the personalized PDC bit design for the Lianggaoshan Formation significantly improves rock-breaking efficiency and service life.